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C s u Proposal 3003 -As Needed Services Reservoir Inspection, Cleaning and Repairs Project No.#OSD 2021-604 City of Pleasanton SERVICES Page 6 Test, Method A" (modified) and/or ASTM D6677 "Adhesion by Knife Test". Any blistering will be quantified in accordance with ASTM D714 `Standard Test Method for Evaluating the Degree of Blistering Paints." The surveys will investigate any areas where rust or other corrosion products are in evidence for erosion, cracking, pitting and/or metal loss. Where applicable, corrosion pits will be measured and compared to obtained steel thickness (UT) measurements. UT work can include underwater surfaces. Any indications of leakage will be determined, and the measurement of bottom sediment will be reported. Assessment Reports The product of the above would be a written narrative and color pictorial description of the condition of each tank along with specific recommendations for coatings, cathodic protection, and structural considerations, where applicable. Recommendations for maintenance work will be based on the level of corrosion and the condition of tank coatings and CP systems. Corrosion assessments will be based on the amount of change from the original tank design. The life expectancy of existing coating systems, as well as the projected corrosion rates on the structures are used to determine the future maintenance strategies. Recommendations for coatings work will be based on paint or lining's percentage of failure, ability to be recoated, film heavy metal content, estimated remaining life of the system(s); and/or concerns with any impressed current cathodic protection system. Recommendation for CP repair work, if required will include a list of required repairs. If the alternative approach to CP assessments is used, then the results of various CP issued, as appropriate. Recommendations for any future retrofitting concerns will also be presented, where identified. CSI will comment on any applicable safety, sanitary, vandalism, and seismic concerns. Safety concerns will include ladder size/design observations, fall-prevention systems, roof access areas, etc- Sanitary concerns will make note of items such as venting and other tank openings such as overflow air-gaps. Vandalism concerns will involve an evaluation of perimeter fencing, locking mechanisms, and climb deterrents. Seismic concerns will address items such as obvious visual indications of tank movement, flexible couplings, drain locations, etc. It should be clear that our cost proposal does not include a seismic analysis of a tank's ability to structurally withstand a probable seismic event, nor does this scope include any geotechnical/soils reports. The report(s) will also include estimated repair costs (if applicable) and prioritization for recommended work. A narrated video will also be included for underwater inspections. Underwater Lining Spot Repair We are also proposing to complete some minor spot repairs on the accessible immersed areas of the tank interiors. Coating defects that are accessible will be spot repaired with an NSF certified underwater curing epoxy. We anticipate that not more than 30 spots will require underwater repairs in each tank. August 23,2021